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| Audomarois Marshes | |
|---|---|
| Name | Audomarois Marshes |
| Native name | Marais Audomarois |
| Location | Pas-de-Calais, Hauts-de-France, France |
| Area km2 | 26 |
| Established | 1986 (Natura 2000), 1999 (UNESCO) |
| Designation | Biosphere Reserve |
Audomarois Marshes is a river-marsh landscape in the Arrondissement of Saint-Omer, located in the Pas-de-Calais department of Hauts-de-France, northern France. The site occupies the floodplain of the Aa (river), lies near the city of Saint-Omer, and forms part of a network of wetlands that includes connections to the Canal de Neuffossé, the Lys (river), and coastal systems linked to the North Sea. The marshes are recognized for integration into international frameworks such as the UNESCO biosphere programme and the Natura 2000 network, reflecting ties to regional planning authorities including the Conseil régional des Hauts-de-France and local communes like Longuenesse and Arques.
The marshes occupy the alluvial plain of the Aa (river) between Saint-Omer and the estuarine zone approaching the North Sea, bordered by transport corridors including the A26 autoroute and historic routes to Calais and Dunkirk. Topographically the area includes polders, peatlands, canals, and meadows carved by drainage works associated with the Canal de Neuffossé and historic engineering by figures linked to regional land reclamation projects overseen by municipal councils of Saint-Omer and neighboring communes. Climatically the site is influenced by the North Atlantic Current and maritime conditions managed in coordination with departments such as Pas-de-Calais (department) and regional bodies in Hauts-de-France.
Human intervention dates to medieval hydraulic engineering connected to monastic institutions such as those in Saint-Omer and civil projects linked to the Burgundian Netherlands period and later administrations like the Kingdom of France and the French Revolution's municipal reorganizations. Strategic considerations tied the marshes to conflicts including operations in the Eighty Years' War and campaigns around Flanders Campaigns, while industrial-era canals connected to networks reaching Lille and Calais. Administrative protections evolved through French laws such as frameworks influenced by the Loi Littoral and Europe-wide measures following the creation of the European Union and the Natura 2000 directive.
The marshes support habitats for species protected under agreements including the Ramsar Convention and networks such as Natura 2000, hosting birds associated with the BirdLife International Important Bird and Biodiversity Areas programme and migrants following the East Atlantic Flyway. Fauna include waterfowl that attract attention from organizations like the Société Nationale de Protection de la Nature and researchers from institutions such as the Muséum national d'histoire naturelle. Vegetation assemblages reflect peat-forming species and reedbeds comparable to sites studied in the Wadden Sea region and by universities including the Université de Lille and research centres collaborating with the Centre National de la Recherche Scientifique.
Hydraulic infrastructure combines historic drains, sluices, and canals exemplified by works on the Canal de Neuffossé and management regimes coordinated by bodies including the Agence de l'eau Artois-Picardie and local syndicats de gestion. Water levels are managed for flood control and agriculture with techniques linked to practices used in the Netherlands and discussed in cross-border initiatives involving authorities from Nord (department) and regional planning agencies. The hydrological regime is influenced by tidal exchange toward the North Sea and riverine inputs from the Aa (river), requiring coordination with civil engineering firms and environmental agencies addressing eutrophication and sediment transport.
Traditional market gardening, particularly cultivation of vegetables destined for markets in Lille, Calais, and Paris, persists alongside grazing and haymaking overseen by farm cooperatives and chambers such as the Chambre d'agriculture du Pas-de-Calais. Historic practices like the use of "hortillons" or small plots, irrigation systems comparable to methods in Picardy, and artisanal fisheries involve stakeholders including local mayors and agricultural unions. Cultural landscapes shaped by centuries of human use are documented by regional heritage bodies like the Conservatoire du littoral and municipal archives of Saint-Omer.
The marshes are part of the UNESCO Biosphere Reserve system and included in the Natura 2000 network, with designations that interface with French national authorities such as the Ministry of Ecological Transition and regional conservation agencies. Protection measures draw on international conventions including the Ramsar Convention and European directives tied to the European Union and require collaboration among local communes, the Parc naturel régional des Caps et Marais d'Opale, and NGOs like LPO (Ligue pour la Protection des Oiseaux). Management plans balance biodiversity objectives with agricultural uses through partnerships involving the Conseil départemental du Pas-de-Calais and research institutions.
The marshes are promoted for ecotourism, boat tours, birdwatching, and heritage visits connected to sites in Saint-Omer such as the Cathédrale Notre-Dame de Saint-Omer and museums collaborating with cultural networks including Pays d'art et d'histoire. Festivals, local markets, and interpretation centers involve cultural actors from regional councils and tourist offices in Hauts-de-France, with links to transport hubs at Gare de Saint-Omer and routes toward Boulogne-sur-Mer and Dunkirk (Dunkerque). Educational programmes are run in partnership with schools and universities like the Université de Lille and environmental associations to promote heritage tied to historic figures and institutions of the region.
Category:Marshes of France Category:Protected areas of Hauts-de-France